BEIJING (AP) — A half-day before a young gunman committed one of the deadliest school attacks in U.S. history, a Chinese farmer took a kitchen knife and hacked at more than 20 children as they entered their rural elementary school.

Though the outcomes are different — 28 dead in Connecticut, and 23 injured in China — the Friday attacks show how disturbingly frequent rampages against children and schools are. Attackers often seek out the vulnerable, hoping to amplify their outrage before they themselves often commit suicide. News of one mass killing often serves as inspiration and blueprint to other potential mass killers.

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